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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c2a90f283f9e03acf70d38bae9c2d138aa454e98cea877b536b8f36639d80598' 
  AND token = 'RA10wfg1XaJ0YeTDk7o74BlHhV4m9traoYmpkndgrXw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}